1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// <vector>
11
12// template <class T, class Allocator, class U>
13// typename vector<T, Allocator>::size_type
14// erase(vector<T, Allocator>& c, const U& value);
15
16#include <vector>
17#include <optional>
18
19#include "test_macros.h"
20#include "test_allocator.h"
21#include "min_allocator.h"
22
23template <class S, class U>
24TEST_CONSTEXPR_CXX20 void test0(S s, U val, S expected, std::size_t expected_erased_count) {
25 ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
26 assert(expected_erased_count == std::erase(s, val));
27 assert(s == expected);
28}
29
30template <class S>
31TEST_CONSTEXPR_CXX20 void test()
32{
33 test0(S(), 1, S(), 0);
34
35 test0(S({1}), 1, S(), 1);
36 test0(S({1}), 2, S({1}), 0);
37
38 test0(S({1, 2}), 1, S({2}), 1);
39 test0(S({1, 2}), 2, S({1}), 1);
40 test0(S({1, 2}), 3, S({1, 2}), 0);
41 test0(S({1, 1}), 1, S(), 2);
42 test0(S({1, 1}), 3, S({1, 1}), 0);
43
44 test0(S({1, 2, 3}), 1, S({2, 3}), 1);
45 test0(S({1, 2, 3}), 2, S({1, 3}), 1);
46 test0(S({1, 2, 3}), 3, S({1, 2}), 1);
47 test0(S({1, 2, 3}), 4, S({1, 2, 3}), 0);
48
49 test0(S({1, 1, 1}), 1, S(), 3);
50 test0(S({1, 1, 1}), 2, S({1, 1, 1}), 0);
51 test0(S({1, 1, 2}), 1, S({2}), 2);
52 test0(S({1, 1, 2}), 2, S({1, 1}), 1);
53 test0(S({1, 1, 2}), 3, S({1, 1, 2}), 0);
54 test0(S({1, 2, 2}), 1, S({2, 2}), 1);
55 test0(S({1, 2, 2}), 2, S({1}), 2);
56 test0(S({1, 2, 2}), 3, S({1, 2, 2}), 0);
57
58 // Test cross-type erasure
59 using opt = std::optional<typename S::value_type>;
60 test0(S({1, 2, 1}), opt(), S({1, 2, 1}), 0);
61 test0(S({1, 2, 1}), opt(1), S({2}), 2);
62 test0(S({1, 2, 1}), opt(2), S({1, 1}), 1);
63 test0(S({1, 2, 1}), opt(3), S({1, 2, 1}), 0);
64}
65
66TEST_CONSTEXPR_CXX20 bool tests()
67{
68 test<std::vector<int>>();
69 test<std::vector<int, min_allocator<int>>> ();
70 test<std::vector<int, test_allocator<int>>> ();
71 test<std::vector<int, safe_allocator<int>>>();
72
73 test<std::vector<long>>();
74 test<std::vector<double>>();
75
76 return true;
77}
78
79int main(int, char**)
80{
81 tests();
82#if TEST_STD_VER > 17
83 static_assert(tests());
84#endif
85 return 0;
86}
87

source code of libcxx/test/std/containers/sequences/vector/vector.erasure/erase.pass.cpp